dmidecode与lspci不同

Question

第一，规则lscpi

lspci | grep Non-Volatile
03:00.0 Non-Volatile memory controller ...

它被解释为(域0)、总线03、设备00、函数0。

dmidecode的相关部分：

dmidecode -t slot
Handle 0x0026, DMI type 9, 17 bytes
System Slot Information
        Designation: PCIE3
        Type: x16 PCI Express 3 x16
        Current Usage: In Use
        Length: Long
        Characteristics:
                3.3 V is provided
                Opening is shared
                PME signal is supported
        Bus Address: 0000:03:02.0

显示域0，总线3，设备2，函数0。

现在，在那里有一座桥，从lspci树中可以看到：

lspci -tv | grep -C 3 Non-Volatile
\-[0000:00]-+-00.0  Intel Corporation Xeon E5/Core i7 DMI2
            +-01.0-[01]--
            +-01.1-[02]--
            +-02.0-[03]----00.0  Non-Volatile memory controller ...

桥是总线0上的设备2，但是dmidecode认为插槽是3总线上的设备2有点奇怪。

Answer 1

man dmidecode说

...
dmidecode  is  a tool for dumping a computer's DMI (some say
SMBIOS) table contents in a human-readable format.
...
While this is a good point in terms of report speed and safeness,
this also makes the presented information possibly unreliable.
...

Linux内核知道它使用的地址。所以我会依赖sysfs和lspci。